Removing California Ceramic Brake Disc/Rotor (Rear)

I have
i) disengaged my parking brake,
ii)lifted the car on to a jack stand,
iii)removed the rear wheel,
iv) removed the brake caliper and
v)removed the brake rotor retaining nut and the locating nut.

The brake rotor still wont come off.

I have put some penetrating oil in around it to try to loosen it, but since its carbon ceramic, im scared to hit it with a rubber mallet, or apply heat. But, i dont know what to do!

I cant damage it as i will be refitting it.

Any ideas?

 

Well, i managed to get it off. Firstly i think i didnt correctly diesngage the parking break, so after looking into the workshop manual, i followed it to the letter.

Then to get the disc off, i heated it, tapped the centre (the "not carbon ceramic") part with a hammer and twisted it left and right. EVentualyl with a lot of clockwise/counter clockwise twisting it came off.